Definition: The parasympathetic nervous system and sympathetic nervous system combined form the autonomic nervous system (ANS). The parasympathetic nervous system is responsible for inhibiting or opposing the effects of the sympathetic nervous system. The parasympathetic nervous system originates in the brain stem and lower part of the spinal cord and increases activity of the intestines and glands, relaxes sphincter muscles, stimulates digestive secretions, slows the heart and dilates blood vessels.
Parasympathetic Nervous System
By Arlin Cuncic, About.com Guide
Updated August 04, 2009
About.com Health's Disease and Condition content is reviewed by the Medical Review Board
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